Estrous cycle is a characteristic of

Options

A. Human females
B. Mammalian females
C. Mammalian females other than primates
D. Mammals

Answer

**Step-by-Step Solution:**

1. **Understanding the Estrous Cycle**: The estrous cycle is a reproductive cycle that occurs in female mammals. It involves a series of physiological changes that prepare the female for potential mating and reproduction.

2. **Differentiating Between Estrous and Menstrual Cycles**:
- The estrous cycle is different from the menstrual cycle. The menstrual cycle is characterized by the shedding of the uterine lining and occurs in primates, including humans.
- In contrast, the estrous cycle does not involve menstruation; instead, it prepares the female for mating during specific periods known as "estrus" or "heat."

3. **Identifying the Organisms with Estrous Cycles**:
- The estrous cycle is characteristic of female mammals other than primates. This includes animals like dogs, cats, cows, and horses.
- Primates, including humans, exhibit a menstrual cycle instead of an estrous cycle.

4. **Conclusion**: Based on the differences between the estrous and menstrual cycles, the estrous cycle is characteristic of "mammalian females other than primates."

**Final Answer**: The estrous cycle is characteristic of mammalian females other than primates.

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